Kullu: Four persons were injured when the passenger vehicle they were travelling in was hit by boulders on the Dharampur-Kotli road in Mandi district on Sunday morning.The vehicle, a Tempo Traveller, overturned on the road, injuring the occupants.A large number of locals gathered at the spot to rescue the injured passengers, who were then taken to a nearby govt hospital. A police officer said the vehicle overturned on the road itself. "If it had fallen off the road, it could have led to a major accident," said the officer.The officer mentioned that an HRTC bus also passed by at the same time and narrowly escaped being hit.